Count extra_bytes correctly
If there is a variable with the same name as the rest of another
variable after removing $, then it will be counted twice. Therefore,
we need to completely replace it with spaces (variable names cannot
contain spaces) in order to correctly calculate the length of a new
string.
fixes https://github.com/i3/i3/pull/5002
Co-authored-by: Ivan Zharov <zhiv.email@gmail.com>
Co-authored-by: Michael Stapelberg <stapelberg@users.noreply.github.com>
5ce8e3241b